#include <iostream>
using namespace std;

class A {
    int a, b;

  public:
    A() : a(0), b(0) { cout << a << ' ' << b << endl; }
    A(int aa, int bb) : a(aa), b(bb) { cout << a << ' ' << b << endl; }
};

int main() {
    A x, y(2, 3);

    return 0;
}
